docs: def cache_installed_wheels(index_url, installed_packages):
      """After installation, pip tells us what it installed and from where.
  
      We build a structure that looks like
  
      .cache/pip-faster/wheelhouse/$index_url/$wheel
      """
      for installed_package in installed_packages:
          if not _can_be_cached(installed_package):
              continue
          _store_wheel_in_cache(installed_package.link.path, index_url)